Riseveinus cervcornutus sp. nov.

(Figs 1–10)

Description. Body length (incl. forewing): ♂, 7.3 mm. Head width (incl. eyes): 1.5–1.6 mm; head length: 1.4– 1.5mm. Crown (Figs 1, 3) about 4/5 length of pronotum and scutellum together.

Anal tube without process. Aedeagal shaft long and slender, with pair of slender apical processes; apodeme bilobed, extended into pair of dorsolateral antlerlike extensions, and crossing aedeagal shaft in lateral view; ventral processes absent (Figs 8, 9).

Type material. Holotype ♂ (QSBG), THAILAND, Chiang Mai, Doi Phahompck NP Kiewiom 2: motane forest, 20°3.331' N 99°8.552' E, 2112 m, 11-18. Vii. 2007, Komwuan Srisom, leg. T2823.

Etymology. The specific epithet, a combination of “ cerv- ” meaning deer, and “ cornutus ” meaning hornlike, refers to the antler-like aedeagal apodemes.

Remarks. This species can be easily distinguished from other species of the genus by its long and slender aedeagal shaft and elongated bilobed aedeagal apodemes (Fig. 9).